Low lagging power factor (PF) is one great problem. Many users find it difficult to cope with the system Power factor due to poor system design and the types of down stream loads. Ways and means to optimise the system PF are available and are not necessarily expensive. The long-term savings and benefits of using these systems far outweighs the initial expenditure.
Leading PF is a more recent problem, again caused due to down stream loads such as Blade Servers etc. This could cause catastrophic failure of standby Gensets due to over loading, if the loads are transferred to them suddenly due to mains failure.
Here is an article that deals with power quality, remedies and recommendations. Read and be educated.
Beware the bite
Paul Studebaker, CMRP, Editor in Chief, PlantServices.com
What to do when power quality eats into energy efficiency.